Machine for cutting a cam serving to control the front-wheel brakes of motor vehicles



April 21, 1925. 1,535,015

` E. M. BALLOT MACHINE FOR CUTTING A CAM SERVING TO CONTROL THE FRONT WHEEL BRAKES OF MOTOR VEHICLES Filed July l1, 1923 2 Sheets-Sheet 1 mi 'l 3,5%

lmlmlm April 21, 1925. 1 1,535,015

' E. M. BALLOT MACHINE Fon CUTTING A om SERVING To coNIEoI. TEE

FRONT WHEEL BRAKES 0F Mo'ron VEHICLES f Filed Ju1y11. 1923 2 Sheets-Sheet 2 Patented Apr. 2l, 1925.

UNITED STATES i,s3s,o15 PATENT OFFICE.

ERNEST MAURICE IBALLOT, OF PARIS, FRANCE.

MACHINE FOR CUTTING A CAM SERVING TO CONTROL THE FRONT-WHEEL BRAKES F q MOTOR VEHICLES.

Application filed July 11, 1923.

To all whom t may concern:

Be it known that I, ERNEST MAURICE BAL- Lo'r, a citizen of the Republic of France, residing in Paris, France, have invented ne-w and useful mprovements in Machines for Cutting a Cam Serving to Control the Front- Vheel Brakes of Motor Vehicles, of which the following is a specification.

This invention relates to a machine for cutting a cam which serves chiefly for the control of front wheel bra-kes for motor ve hicles.

The said cam, which has a special shape as set forth in my copending patent application (now Patent Number 1,489,732, dated April 8, 1924) is given a pivoting motion with respect to the sleeve upon which it acts whereof the axis occupies one or more diiierent relative positions according as the brake 'segments are new or are more or less worn.

To obtain this result we dispose ina movable work-holding head,. the cube or like piece out of which the said cam is to be cut, so as to give the said piece, with respect to two suitably disposed milling cutters, all the movements which the cam is to assume, when in actual use, with reference to the faces of the sleeve which it controls.

The said machine comprises a disc which imparts to the cube under operation all the various movements desired, whilst a suitable cradle will give the said cube two positions which correspond respectively with the cases wherein the segments are new or worn. With the said cradle, the two lateral faces can be out in one operation with the pair of milling cutters in use, and then the top and bottom are cut by rotating the said cradle through 90 degrees.

The appended drawings which are given by way of example illustrate the said invention.

Fig. 1 is a view of the machine partly in elevation and partly in longitudinal plan.

Fig. 2 is a. transverse section of the same.

Fig. 3 is a view of the arrangement for pivoting the cam upon its axis.

Fig. 4 is a plan view of the machine taken approximately on line 4-4 oi' Fig. 1.

The following description sets forth the machine according to the invention together with the principal elements of the same.

1 indicates the base plate upon which is mounted the whole apparatus which is rev oluble about the axis 3 by means of the Serial No. 650,937.

circular portion 2 which is integral with a U-shaped support 4. A cradle 5 is'mounted between the two branches of said support and is secured thereto by the horizontal axles 6, 6 and the nuts 7, 7 the said cradle can be inclined at will and held in a given position by means of a disc 8 secured thereto by the bolts 9 and having the. notches 10 co-operating with the latch 11 which is mounted upon the support 4 and can be controlled by the handle 12.

A disc 13 movable on the vertical shaft 14 is disposed upon the said cradle and in such position that coincidence will take place between the axes of the two pivotal connections 3 and 14 when the latter is in the vertical position. A quadrant 15 secured to the lower part of said disc co-operates with a worm 16 whose shaft has a square end 17 adapted for easy rotation by means of a wrench, so as to obtain the motion corresponding to the steering of the wheels, this being obtained herein by the rotation of the disc 13 about the axle 14.

Upon the said disc is secured the work` holding head 18 comprising a sleeve 19 having therein a cylindrical sleeve 20 containing, in the bearings 20 thereof, the shaft 21 of the cam under operation. The shaft 21 is inclined to the axis ol the pivot axles 6 and 6 forming an angle thereby which is equal to the complement of the angle which would be formed by the intersection of the center line or' the shaft 21 with the center line of the pivoting axle 14. A cone 22 which can be pressed by means of a suitably formed nut 23 against the shaft 21 serves to hold the latter in position.

A disc 24 secured to the sleeve 2O and having the notches 25 co-operating with the latch 26 serves to hold the said cylindrical sleeve 20 in position as desired; and consequently to hold fast the said shaft with respect to the head 18, whilst the whole device can be rotated in the sleeve 19 by means of the handle 28. The milling cutters for shaping the cam are disposed at 27 in two parallel planes at either side of the axis of the pivots 3, 14.

The said apparatus is operated as fol* lows:

The cam is first placed between the two milling cutters 27, and the cam shaft 21 is then secured in the sleeve 20, the latter being held in the position corresponding to the intermediate notch 25. Thecradle is placed in the vertical position, and the axis ot .the pivots 6, G in a plane parallel with the milling cutters. One then turns the worm 16 in order to pivot the disc 13 by an amplitude corresponding to `that oit the steering othe front wheels ot the motor vehicle, and during this period the milling cutters will cut out the cam according to a cylinder.

When this operation has been performed, the shaft 21 is moved on its airis to an angle ot l5 degrees in either direction according to whether the cam is to serve tor a right or lett hand wheel and it is the-n held in this latter position by the latch 26.

To torni the additional surfaces upon the cam which are to befused in connection with certain segments of the brake, `the cradle 5 is :turned upon its axis @#6 until the cam is lreturned to its initial posit-ion with respect to the milling cutter. rlhe cradle is then locked in this position 'by the latch 1l. rlhe cutters are again brought into use, and the disc 13 is now moved Aby the turning oit the worm gear 16 so as to form a cone upon the surface out the cani, and the two lateral faces thereoit are now completed.

vTo torni the upper and lower faces, alter bringing the lat-ch 26 into the intermediate notch the said 'cradle is pivoted on lthe axis 6, through 90 degrees so as to place it in the horizontal position. lhen the cradle. hasbeen secured in this position, since the shat'tQl is no longer in a plane parallel with `the cutters, it is ybrought into this plane by turning the disc 2 on the centre by angle representing the complement ot the angle between the pivoting axis and the axis ot the cam. When these operations are performed, one again rotates the worm 1G so as to produce the motion corresponding to the steering. Y

It only remains to turn the cani through 15 degrees on the axes of shaft 21 and then tor rotate the cradle in the proper `direction through a like angle on theaxis G, G and to pivot tor the last time the disc 13 on t-he axis 14;.

ln this manner the cani will be cut according to theI surfaces desired; since the dil'erent 15 degree rotations made during the operation correspond to the positions ot the sleeve after the wear ot the segments, the amount ot this angle which is given by way Vof example may he Vditi'erent troni what is above stated.

In this machine the milling cutters have alixed position, andthe said cam is given the movements which it is `to assume upon the vehicle with respect to ythe sleeve .which it controls. Obviously, a surface analogous to the one mentioned may be had by maintaining the same relative motion oit the cutters and the cam, Whether the cam alone ,is lined or the two parts are movable at the same time.

Further, the said apparatus may be moditied in detail, and chiefly as concerns the control ot the movable disc 13, or ythe fasten ing devices, without `departing 4from the principles of the .invention Aas expressed by the-.scope vof the claims.

l. claim:

l. A cam cuttingA machine ot the character described comprising a cam supporting sleeve, means tor supporting said sleeve whereby it may he niorable about fouriaxes,

one `oi tl se axes being that ot fthe cam, :two i cutters .arranged in such va manner as to cutv simultaneously upon the cani, and retaining means tor permitting the cam to be .cut in one position determined `with respect to the other three axes. i

il caincutting machine ot the character described comprising a .pivotall7 supported cradle, a horizontally movable .disc supported hysaidcradle, a `worlrliolding sleeve i arranged upon said discpmeans for rotating said sleeve and means for holding saidsleeve in its rotated position.` v

A cam cutting .machine `of the chariacter described comprising a base, a LU- shaped support pivotally supported upon` said base, a movable cradle supported within said Ushaped support, a horizontally inovable disc'carried by said cradle having its axis extending in alignment with the axis otsaid U-shaped support, a worm geaimand quadrant tor transmitting motion .to isaid disc, an adjustable work supporting sleeve carried by said disc, and means for,` retaining said sleevein its adj usted gposition.

4. A `cam cutting .machine vot' the char-` acter described comprising a pivotally mounted U-shaped support, a cradle pivotally connected to the vopposite ends of said U-shaped support, .adapted to move iin a lateral direction, aV discpivotally,supported upon said U-shaped support and capable ol' movement in a horizontal plane, a work supporting sleeve mounted upon said disc and extending in a diagonal direction between the ends ot' said U-shaped support, and means tor moving said sleeve.

In witness whereof I ai'lix my signature.

ERNEST MAURICE fBALLOT.` 

